P4802ACMC datasheet(178/212 Pages) TECCOR

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Overcurrent Protection

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SIDACtor® Data Book and Design Guide

To select the most appropriate combination of TeleLink SM fuse and SIDACtor device,

decide the regulatory requirement your equipment must meet:

For applications that do not require agency approval or multiple listings, contact the factory.

Power/Line Feed Resistors

Typically manufactured with a ceramic case or substrate, power and line feed resistors

have the ability to sink a great deal of energy and are capable of withstanding both lightning

and power cross conditions.

Advantages

Power and line feed resistors are available with very tight resistive tolerances, making them

appropriate for applications that require precise longitudinal balance.

Restrictions

Because power and line feed resistors are typically very large and are not available in a

surface mount configuration, these devices are less than desirable from a manufacturing

point of view. Also, because a thermal link is typically not provided, power and line feed

resistors may require either a fuse or a PTC to act as the fusing element during a power

cross condition.

Applications

Power and line feed resistors are typically found on line cards that use overvoltage

protectors that cannot withstand the surge currents associated with applicable regulatory

requirements.

Flameproof Resistors

For cost-sensitive designs, small (1/8 W - 1/4 W), flameproof metal film resistors are often

used in lieu of PTCs, fuses, and power or line feed resistors. During a transient condition,

flameproof resistors open when the resultant energy is great enough to melt the metal used

in the device.

Advantages

Flameproof resistors are inexpensive and plentiful.

Regulatory Requirement

TeleLink SM Fuse

SIDACtor Device

GR 1089

F1250T

C Series

TIA-968, Type A

F1250T

B Series

TIA-968, Type B

F0500T

A Series

ITU K.20

F1250T

A Series

ITU K.21 Basic/Enhanced

F1250T

A Series

UL 60950

All

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